/Engine/Plugins/Runtime/Metasound/Source/MetasoundFrontend/Public/MetasoundFrontendDocumentBuilder.h
Returns whether or not the given edge can be added, which requires that its input is not already connected and the edge is valid (see function 'IsValidEdge').
bool CanAddEdge ( const [FMetasoundFrontendEdge](API\Plugins\MetasoundFrontend\FMetasoundFrontendEdge) & InEdge ) const